When asked about Green Book's best picture win, Spike Lee said: 'The ref made a bad call.' The film, which stars Viggo Mortensen and Mahershala Ali, triumphed over a diverse field including Lee’s BlacKkKlansman, Roma, Vice, A Star Is Born, The Favourite, Black Panther and Bohemian Rhapsody. Green Book has been dogged by controversy and its handling of race has been criticised as conforming to Hollywood's 'white saviour' trope